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<br />
<h1><big>larch</big>
–
a do-it-yourself live <em>Arch Linux</em> CD</h1>
<img style="border: 0px solid ; width: 320px; height: 320px;" alt="" src="larch1.jpg"
name="graphics1" align="right" hspace="10" vspace="10" />
<br /><br />
<h2>/etc/fstab and mount points</h2>
<p>The file /etc/fstab determines mount points for the various devices and partitions
available in the system. This is of course different in every computer, so a live CD
has to be pretty flexible here. <em>larch</em> handles this by regenerating this file
each time it boots, basing the content on the devices it discovers in the present system.
</p>
<p>Disk partitions are not mounted automatically by <em>larch</em>, as one of the main
purposes was to act as an installation CD - for partitioning and formatting the
partitions must be unmounted. But each detected disk partition and CDROM device should
get an entry in '/etc/fstab' and a corresponding mount point in '/mnt'. Thus they
can be mounted using 'mount /mnt/DEVICE' (or by using, say, KwikDisk in KDE).
</p>
<p>It may however, under certain circumstances, be desirable to have a persistent
'/etc/fstab'. This can be achieved by placing "#KEEP" (without the quotation marks)
at the beginning of a line in '/etc/fstab'. This could be done when making the
original CD by putting the desired '/etc/fstab' file in the <em>overlay</em>,
or else - in the case of a rewritable boot medium (e.g. USB-stick) - by
editing '/etc/fstab' while running the live system and then performing a session
saving reboot.
A new '/etc/fstab' (and the associated mount points in '/mnt') can be generated
at any time while running <em>larch</em>, by executing '<strong>gen_fstab -l</strong>'.
This might be useful after repartitioning, for example. When the '-l' option is
omitted, no updates are made, but the proposed changes are saved to '/tmp/fstab'
and '/tmp/mnt'.
</p>
<h4><a name="lvm"></a>LVM</h4>
<p><em>larch</em> can also handle LVM volumes, including automatically
generating entries in '/etc/fstab' and mount points in '/mnt'.
This must however be enabled
in '/etc/rc.conf' (e.g. by putting the required entries in 'rcconfx' in the
<em>profile</em> used to build the <em>larch</em> system). USELVM="yes" must
be set and the module 'dm-mod' must be loaded (this is done
automatically when USELVM="yes" is set). The supplied 'mini2' and 'xmini' example
profiles contains this feature, and can thus be taken as an example.
</p>
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